who gets first map pick

is there any way to know ahead of time? if so how? or does riot decide at gametime or something

isn't it like a coin toss or something or is there an actual way they choose it?

Regards
Aperture
Son of Oil, Father of QueueK and Causer of Arguments

I thought upper seeding gets priority on if they want map pick first or not?

Seeding
Higher seeding gets to pick the map first